Introducing Sirris Suspension — a new era in E-Moto suspension performance.

Precision Parts. Race Ready. Built to Last.
Purpose-built specifically for E-Moto platforms, the R46 transforms your Surron Ultra Bee into a high-speed, race-capable machine with unmatched rear-end control and responsiveness.

R46 Rear Shock

Exceptional Responsiveness. Ultimate Tuning Control.

The Sirris R46 is a pressure-balanced, fully adjustable rear shock engineered to harmonize perfectly with aggressive riding styles. Designed around a large 46mm piston architecture, it delivers consistent damping performance, superior heat management, and maximum traction.

Key Performance Features

Fully Tunable Suspension

• External compression and rebound adjustment

• Spring rates matched to rider weight and riding style

• Adaptable setup for trail, street, track, or aggressive off-road

LSC – Low Speed Compression

Provides superior pressure balance and frequency response for enhanced control during acceleration, braking, and cornering.

Optional DSC (Dual Speed Compression)
Currently in final development (expected early 2025). DSC will offer a wider adjustment range and is cross-compatible with the current LSC (requires rebuild). Both systems will be available as service parts.

Built for E-Moto Abuse

High Durability Finishing

• Type 3 hard anodized body cap, body, reservoir, end cap, spring hardware, and clevis

• Induction heat-treated, hard chrome hollow shaft

• Designed to maintain appearance and performance after thousands of miles

Extremely Easy to Rebuild

Fully serviceable architecture for simple rebuilds and custom tuning.

Lightweight

Weighs only 3.9 lbs (1.76 kg) without spring.

Fitment & Installation

320 mm x 85 mm
Direct bolt-on replacement for the Surron Ultra Bee.

Important – Rear Triangle Fitment

The R46 is engineered with the largest possible piston design while maintaining compatibility with the stock linkage. Due to manufacturing tolerance variations in stock Ultra Bee triangles, minor spring-to-triangle contact may occur.

For guaranteed clearance, Sirris strongly recommends installing the Sirris rear triangle during shock installation.

⚠️ Warning:
Some aftermarket triangle links may interfere with the shock body or spring. Always check clearance while assembling and cycling the suspension. Do not install if interference is detected. Improper installation can result in loss of control, serious injury, or death.

Technical Specifications

Model: R46 – Surron Ultra Bee Spec
Architecture: Piggyback, steel spring
Length: 320 mm
Stroke: 85 mm
Weight: 3.9 lbs / 1.76 kg (without spring)

Internal Components

• Piston: Ø46 mm high-flow CNC 6061 billet aluminum, Type 3 hard anodized

• Piston Band: Hard band

• Shaft: Ø16 mm chrome-plated, induction hardened steel, hollow (Ø5.5 mm ID)

• Shock Body: Seamless 6061 aluminum, Type 3 hard anodized, ACME thread

• Spring Retainer: Seamless 6061 aluminum, locking feature, manual adjust

• Bottom Out: MCU bumper

• Top Out: Rubber bumper

• Reservoir: Pressurized with floating piston

• Adjusters: External compression and rebound

• Seals: NBR

Made for You

Spring options available for riders up to 300 lbs (135 kg) with high-tensile steel spring rate selections to match riding style and terrain.

The Sirris R46 is not just an upgrade — it’s a complete transformation of your Ultra Bee’s rear suspension performance.